J/MNRAS/526/4768 Galaxy Zoo DESI (Walmsley+, 2023)
Galaxy Zoo DESI: Detailed Morphology Measurements for 8.7M Galaxies in the
DESI Legacy Imaging Surveys.
Walmsley M., Heron T., Kruk S., Scaife A., Lintott C., Masters K.L.,
Dawson J.M., Dickinson H., Fortson L., Garland I.L., Mantha K., O'Ryan D.,
Popp J., Simmons B., Baeten E.M., Macmillan C.
<Mon. Not. R. Astron. Soc. 526, 4768-4786 (2023)>
=2023MNRAS.526.4768W 2023MNRAS.526.4768W (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies ; Morphology ; Optical
Keywords: methods: statistical - catalogues - software: data analysis -
galaxies: bar - galaxies: general - galaxies: interaction.
Abstract:
We present detailed morphology measurements for 8.67 million galaxies
in the DESI Legacy Imaging Surveys (DECaLS, MzLS, and BASS, plus
DES). These are automated measurements made by deep learning models
trained on Galaxy Zoo volunteer votes. Our models typically predict
the fraction of volunteers selecting each answer to within 5-10 per
cent for every answer to every GZ question. The models are trained on
newly collected votes for DESI-LS DR8 images as well as historical
votes from GZ DECaLS. We also release the newly collected votes.
Extending our morphology measurements outside of the previously
released DECaLS/SDSS intersection increases our sky coverage by a
factor of 4 (5000.19000deg2) and allows for full overlap with
complementary surveys including ALFALFA and MaNGA.
Description:
Detailed morphology measurements for bright (r<19) galaxies in the
DESI Legacy Imaging Surveys footprint. These measurements estimate the
presence of bars, spirals arms, ongoing mergers, and more.
These catalogs are created by training deep learning models on
Galaxy Zoo volunteer responses, to predict what volunteers might say
for new galaxies. The models are available at
www.github.com/mwalmsley/zoobot. Our measurements are predicted vote
fractions i.e. the fraction of volunteers expected to select a given
answer for a given question.
For example, the column
"smooth-or-featuredsmoothfraction"
gives the fraction of volunteers answering "smooth" to
"is this galaxy smooth or featured"?
The fraction denominator is the number of volunteers asked that
question.
Whether a question is asked depends on a volunteer's previous answers.
The catalog measures the morphology visible in the image. Be careful
to consider observational biases. For example, galaxies at higher
redshift appear less featured.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
catalog.dat 227 8689370 Catalog of detailed morphology measurements
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See also:
VII/292 : DESI Legacy Imaging Surveys DR8 (Duncan, 2022)
www.github.com/mwalmsley/zoobot : Models Home Page
Byte-by-byte Description of file: catalog.dat
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Bytes Format Units Label Explanations
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1- 12 A12 --- dr8Id Primary key brickid_objid (dr8_id)
14- 23 F10.6 deg RAdeg Right ascension (J2000) (ra)
25- 34 F10.6 deg DEdeg Declination (J2000) (dec)
36- 41 I6 --- brickid DESI-LS DR8 brickid in Tractor catalog (brickid)
43- 47 I5 --- objid DESI-LS DR8 objid in Tractor catalog (objid)
49- 52 F4.2 --- SFSM ? "Is this galaxy smooth or featured" fraction
(smooth-or-featuredsmoothfraction)
54- 57 F4.2 --- SFFDF ? "Is this galaxy smooth or disk featured"
fraction
(smooth-or-featuredfeatured-or-diskfraction)
59- 62 F4.2 --- SFAF ? "Is this galaxy smooth or featured artifact"
fraction (smooth-or-featuredartifactfraction)
64- 67 F4.2 --- DEOYes ? "Is this galaxy has disk edge on (yes)"
fraction (disk-edge-onyesfraction)
69- 72 F4.2 --- DEONo ? "Is this galaxy has disk edge on (no)"
fraction (disk-edge-onnofraction)
74- 77 F4.2 --- SAYes ? "Is this galaxy has spiral arms (yes)"
fraction (has-spiral-armsyesfraction)
79- 82 F4.2 --- SANo ? "Is this galaxy has spiral arms (no)" fraction
(has-spiral-armsnofraction)
84- 87 F4.2 --- BS ? "Is this galaxy has bar strong" fraction
(barstrongfraction)
89- 92 F4.2 --- BW ? "Is this galaxy has bar weak" fraction
(barweakfraction)
94- 97 F4.2 --- BNo ? "Is this galaxy has bar (no)" fraction
(barnofraction)
99-102 F4.2 --- BSD ? "Is this galaxy has bulge size dominant"
fraction (bulge-sizedominantfraction)
104-107 F4.2 --- BSL ? "Is this galaxy has bulge size large" fraction
(bulge-sizelargefraction)
109-112 F4.2 --- BSM ? "Is this galaxy has bulge size moderate"
fraction (bulge-sizemoderatefraction)
114-117 F4.2 --- BSS ? "Is this galaxy has bulge size small" fraction
(bulge-sizesmallfraction)
119-122 F4.2 --- BSNo ? "Is this galaxy has bulge size (none)" fraction
(bulge-sizenonefraction)
124-127 F4.2 --- RR ? "Is this galaxy completely round" fraction
(how-roundedroundfraction)
129-132 F4.2 --- RIB ? "Is this galaxy is in-between roundness"
fraction (how-roundedin-betweenfraction)
134-137 F4.2 --- RCS ? "Is this galaxy has cigar-shaped" fraction
(how-roundedcigar-shapedfraction)
139-142 F4.2 --- EOBB ? "Is this galaxy has edge on bulge boxy"
fraction (edge-on-bulgeboxyfraction)
144-147 F4.2 --- EOBNo ? "Is this galaxy has edge on bulge (none)"
fraction (edge-on-bulgenonefraction)
149-152 F4.2 --- EOBR ? "Is this galaxy has edge on bulge rounded"
fraction (edge-on-bulgeroundedfraction)
154-157 F4.2 --- SWT ? "Is this galaxy has spiral winding tight"
fraction (spiral-windingtightfraction)
159-162 F4.2 --- SWM ? "Is this galaxy has spiral winding medium"
fraction (spiral-windingmediumfraction)
164-167 F4.2 --- SWL ? "Is this galaxy has spiral winding loose"
fraction (spiral-windingloosefraction)
169-172 F4.2 --- SAC1 ? "Is this galaxy has 1 spiral arm" fraction
(spiral-arm-count1fraction)
174-177 F4.2 --- SAC2 ? "Is this galaxy has 2 spiral-arms" fraction
(spiral-arm-count2fraction)
179-182 F4.2 --- SAC3 ? "Is this galaxy has 3 spiral-arms" fraction
(spiral-arm-count3fraction)
184-187 F4.2 --- SAC4 ? "Is this galaxy has 4 spiral-arms" fraction
(spiral-arm-count4fraction)
189-192 F4.2 --- SAC4+ ? "Is this galaxy has more than 4 spiral arms"
fraction (spiral-arm-countmore-than-4fraction)
194-197 F4.2 --- SACCT ? "Is this galaxy has spiral arms count cant
tell" fraction
(spiral-arm-countcant-tellfraction)
199-202 F4.2 --- MNo ? "Is this galaxy has merging (none)" fraction
(mergingnonefraction)
204-207 F4.2 --- MMiD ? "Is this galaxy has merging minor disturbance"
fraction (mergingminor-disturbancefraction)
209-212 F4.2 --- MMaD ? Is this galaxy has merging major disturbance"
fraction (mergingmajor-disturbancefraction)
214-217 F4.2 --- MM ? "Is this galaxy has merging merger" fraction
(mergingmergerfraction)
219-223 A5 --- Version GZ DESI release (catalog_version)
225-227 A3 --- DR [DR8] Legacy survey data release
(legacysurveydata_release)
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History:
From Mike Walmsley, m.walmsley(at)utoronto.ca
Acknowledgements:
The data in this paper are the result of the efforts of the Galaxy
Zoo volunteers, without whom none of this work would be possible.
(End) Patricia Vannier [CDS] 11-Sep-2023